Barbie's Lovely Sleep-Ins was on the market in 1970. This is one of my top ten mod Barbie outfits. You can see Mary Tyler Moore wearing an ensemble very close to this on the Dick Van Dyke show episode entitled "I'd rather be bald than have no head at all" (Season 3, episode 30). The fashion includes:
pink nylon nightgown
pink nylon robe with floral pattern. The Barbie tag is located here.
fuzzy plush slippers
You can find this Barbie fashion near mint and complete for about $60. So pink, so Barbie....